Question

Q: Implement an equals method for the ADT list that returns true when the entries in one list equal the entries in a second list. In particular, add this method to the class AList. The following is the method header:
public boolean equals (Object other)

public class AList<T>{
private T list[];
private int capacity = 100;
private int numOfEnteries =0;

public AList(){
list = (T[])new Object[capacity + 1];
}
public void add(T element){
numOfEnteries++;
if (numOfEnteries >capacity)
System.out.println ("Exceed limit");
else
list[numOfEnteries] = element;
}
  
public boolean isFull(){
return numOfEnteries==capacity+1;
}
  
public boolean isEmpty(){
return numOfEnteries==0;
}
  
public void add (int position, T element){
if (position <0 || position >capacity+1){
System.out.println("Error");
}
else{
if (position >numOfEnteries){
numOfEnteries++;
list[numOfEnteries] = element;
}
else{
for (int i = numOfEnteries+1 ;i>=position; i--){
list[i]= list[i-1];
}

list[position] = element;
  
}
  
}
  
}

}

Answer 1

@Override
public boolean equals(Object obj) {
    if (this == obj)
        return true;
    if (obj == null)
        return false;
    if (getClass() != obj.getClass())
        return false;
    AList other = (AList) obj;
    if (numOfEnteries != other.numOfEnteries)
        return false;
    for(int i=0; i<numOfEnteries; i++) {
        if(list[i] == null && other.list[i] == null) {
            continue;
        }
        if(list[i] == null || other.list[i] == null) {
            return false;
        }
        if(!list[i].equals(other.list[i])) {
            return false;
        }
    }
    return true;
}

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